PHY 2049 Midterm: University of Florida PHY 2049 exam4_sols
Document Summary
Fall 2002: a closed surface consists of a hemispherical bowl of radius r along with a circular cap . This surface is placed in a uniform magnetic eld of magnitude b which is parallel to its axis. Solution: the second maxwell equation ( gauss"s law for magnetic elds ) tells us that the magnetic ux through any closed surface is zero. This is a mathematical statement of the experimental fact that there are no magnetic monopoles : the gure shows two small diamagnetic spheres, one near each end of a bar magnet. Answer : the forces on 1 and 2 are both repulsive. Solution: diamagnetic materials develop an induced magnetic moment which is opposed to the applied eld. This will lead to a repulsive force on both spheres: a parallel-plate capacitor of capacitance c = 2 10 3 f has circular plates with radius.
